Explanation:

• An integrated flood warning system - known as IFLOWS-Mumbai was launched making Mumbai the second city in India after Chennai to have such a system. IFLOWS-Mumbai is developed as a state of art Integrated Flood Warning system for Mumbai. 
• It is developed by the Ministry of Earth Sciences (MoES), in coordination with the Municipal Corporation of Greater Mumbai (MCGM).
• The IFLOWS-Mumbai comprises seven modules, namely data assimilation, flood, inundation, vulnerability, risk, dissemination and decision support system.
• Cyclone Nisarga missed the city narrowly on June 3 , 2020.The recent flood on 29 August 2017, brought the city to a standstill. The flood during 26th July 2005, is probably etched in the memory of every Mumbai citizen, when the city received a rainfall of 94cm, a 100 year high in a span of 24 hours paralyzing the city completely.  Hence only statements 1&2 are correct.